Peel and slice peaches/apples, fill 9x13 pan with them.
Add blueberries over top of those.
Make topping - mix about a cup of butter/margarine with about a cup of brown sugar, add in oats until it's crumbly (2-3 cups maybe - guessing - it's an art, not a science)
Bake at 350 or so for about 45 minutes or so (stick a knife into it - they should go through apples/peaches with no effort)
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